`who killed the bird?` the passive form of the sentences is-
who was killed by the bird?
who was killed the bird?
By whom the bird was killed
By whom was the bird killed?
Explanation:
Correct Answer is: By whom the bird was killed

who was killed by the bird?
who was killed the bird?
By whom the bird was killed
By whom was the bird killed?
Correct Answer is: By whom the bird was killed

What is the `noun` form of the word `beneficial`? Option A: benificialness , Option B: benefit , Option C: beneficient, Option D: beneficiary, correct answer is: benefit
What is the noun form of the word `know`? Option A: knowing , Option B: knowledge , Option C: knowledgeable, Option D: known, correct answer is: knowledge
You should dress for cold weather today. Here the underlined word is a : Option A: Conjunction , Option B: Preposition , Option C: verb, Option D: noun, correct answer is: verb
`Forgiveness in a great virtue`.Which class of noun `forgiveness`` belongs to? Option A: Collective , Option B: Common , Option C: Material, Option D: Abstract, correct answer is: Abstract
Human brain is the most sophisticated machine. Here `sophisticated` is a/an___. Option A: noun , Option B: verb , Option C: adjective, Option D: adverb, correct answer is: adjective